runtime: copy memory hash code from Go 1.7

runtime: copy memory hash code from Go 1.7

    Rewrite the AES hashing code from gc assembler to C code using
    intrinsics.  The resulting code generates the same hash code for the
    same input as the gc code--that doesn't matter as such, but testing it
    ensures that the C code does something useful.

    Also change mips64pe32le to mips64p32le in configure script--noticed
    during CL review.

    Reviewed-on: https://go-review.googlesource.com/34022

From-SVN: r243445